Process for polishing cement tiles.



UNITED STATES PATENT OFFICE.

FRANZ RICHARD rnomli. on nnirzie, AND osennrnmrexn, or nnm'rscn,

GERMANY.

PROCESS FOR POLISHING CEMENT 'JJILIEIS.-

No Drawing.

Specification of Letters .Patent. Application filed March 4, 1911.Serial No. 612,380.

To all whom it may concern: 7 Be it known that we, FRANZ RICHARD TrroMliand OSCAR PANNIOKE, the first a subject. of the Kingof Saxony, and thesecond a subject of the King of Prussia, residing at Leipzig andDelitsch, in the Kingdom of Saxony, Germany, respectively, have inventedcertain new and useful Improvements in Processes for Polishing CementTiles, of which the following is a specification.

Cement tiles have up to the present been" .process for polishing cementtiles.

The tiles treated according to the improved process show such a perfectpolish as up to the present has never been obtained with cement tiles.This polish is not only of very fine appearance but also bf greatdurability. The colors of the plate which generally with cement tilesappear rather dull are very brilliant.

The improved process is as follows :-',For the manufacture of cementtilesto be polished Portland cement :of very good quality has td beused. For coloring the cement tiles there',must not be used ultramarineor green ultramarine, as these colors would alter under the influence ofthe compositions .used for carrying out the improved polishingprocess.

A prineipal part of the process consists inwell hardening the surface.of' the cement. With this object in viewjthe tiles are treated duringtwo to three days and once or twice every day with a solution of 1kilogram of magnesium fluohydrate and 4 liters of water; this solutionand then left to dry. After ously stirred, 100

the tiles are, well impregnated with ish'ed. For the grinding of thecement tiles the. following solution 1s used :'-375 gramsof shellac aregradually molten, 650 grams of emery No. 00 and 25 grams of bi-oxalateof potassi m are stirring. I

-'The polishing stone is prepared by meltfing 400. grams of shellac inan enameled pot; to this shellac, which is being continu- 600 grams, ofemery No. 0000,

grams of sublimated sulfur and grams of borax of best quality aregradually added.

The solution is thenpoured into a wooden mold and left to cool.For'producing the high polish on the cement tiles a polishing powder isused which is composed of 5 parts of sublimat'ed sulfur and of' 1' partof tin-putty which are inti- .-The cement matel'y mixed in the mortar.tile is rubbed with this powder by means of a piece of felt until theperfect polish is obtained. -When"the polishing powder. 1s

being put on the plate some drops of Water are preferably added.

We claim An. improved ment tiles, consisting in coloring the tile madefrom Portland cement of good quality,

in impregnating lution composed of 1 kilogram of magnediluted in 4liters of water,

in leaving the impregnated tiles to dry and same with a powder composedof sublimate of sulfur and tin-putty.

Innvitness whereof we have hereunto set our hands in the presence of twowitnesses.

FRANZ RICHARD THOMA. Y OSCAR PANNICKE. Witnesses:

ALBER R. Momwn'rz, RUDOLPH .FR'ICKE,

the tiles have dried they are ground and pol so process for producing aweatherproof high polish on colored ce- Patented Julyao, 1912.

the colored tile with a so- 'in rubbing the same after they have dried

